su supporters, "we know that you're ork."; we're angry, too, but ley: qce won't work." >> pelley: quieter in cairo at thanks r now. holly, thanks very much. correspondent charlie d'agata is in benghazi, libya, where the i,bassador and the other americans died. he is learning more now about oday mohr killers might be. >> reporter: today mohammed magarief, the president of libya's national congress, visited the crime scene to have a look around. eople beonfident that the men behind this, the people behind this, will be caught? akes yinitely. >> reporter: why, what makes you so confident? >> sooner or later, because everyone is determined to. nd the attr: it's still unclear who's behind the attacks but a radical islamic group, ansar al sharia, is considered a top suspect. the group is well known and based in benghazi, emerging after the fall of former dictator moammar qaddafi. bu but libya's deputy interior minister said he's looking at a number of different groups.